5165401221 has 6 divisors (see below), whose sum is σ = 7461135110. Its totient is φ = 3443600808.

The previous prime is 5165401211. The next prime is 5165401229. The reversal of 5165401221 is 1221045615.

5165401221 is a `hidden beast` number, since 5 + 1 + 654 + 0 + 1 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4145556996 + 1019844225 = 64386^2 + 31935^2 .

It is not a de Polignac number, because 5165401221 - 2⁷ = 5165401093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5165401229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286966726 + ... + 286966743.

Almost surely, 2^5165401221 is an apocalyptic number.

It is an amenable number.

5165401221 is a deficient number, since it is larger than the sum of its proper divisors (2295733889).

5165401221 is a wasteful number, since it uses less digits than its factorization.

5165401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573933475 (or 573933472 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 5165401221 is about 71870.7257581277. The cubic root of 5165401221 is about 1728.6272448413.

Adding to 5165401221 its reverse (1221045615), we get a palindrome (6386446836).

The spelling of 5165401221 in words is "five billion, one hundred sixty-five million, four hundred one thousand, two hundred twenty-one".